Sierra 18-8519 Exhaust Elbow Mounting Kit | MerCruiser Inboard Exhaust
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Sierra 18-8519 Exhaust Elbow Mounting Kit — MerCruiser Inboard Exhaust
Secure your exhaust elbow properly with the Sierra 18-8519 mounting kit — an OEM-quality replacement hardware set for MerCruiser inboard and sterndrive exhaust systems. This kit contains the fasteners, washers, and hardware required to correctly mount the exhaust elbow to the exhaust manifold, ensuring a leak-free, vibration-resistant connection that holds up to the heat and movement of a running marine engine.
Sierra Marine is a leading manufacturer of aftermarket marine engine parts, producing components to OEM specifications for MerCruiser, Volvo Penta, Yamaha, and other major marine engine brands. The 18-8519 kit is a direct-fit replacement for compatible MerCruiser applications.
Key Features
- Part number: 18-8519 (Sierra Marine)
- Complete mounting hardware kit for exhaust elbow installation
- OEM-quality specification — direct fit for compatible MerCruiser engines
- Includes fasteners and hardware for a secure, leak-free elbow mount
- Resists heat and vibration in marine exhaust applications
Best Use Case
Best suited for replacing worn, corroded, or missing exhaust elbow mounting hardware on compatible MerCruiser inboard and sterndrive engines. Always replace the mounting hardware when removing and reinstalling an exhaust elbow — reusing old fasteners risks stripped threads, uneven clamping, and exhaust leaks. Inspect the exhaust elbow gasket at the same time and replace if there is any sign of deterioration or carbon tracking. Confirm engine model and year against the Sierra application guide before ordering.
Parts Desk Insights
Exhaust elbow mounting kits are a natural companion sale any time a customer is purchasing an exhaust elbow, riser, or manifold. Always ask whether they have the gaskets — cross-sell the Sierra 18-0305-1 Exhaust Elbow Gasket and the Sierra 18-0943-2 Exhaust Elbow Gasket (2-pack) for a complete service. For customers replacing the full exhaust assembly, see the Sierra 18-1908K Riser Kit, Sierra 18-1927 Riser, Sierra 18-1953-2 Manifold, and Sierra 18-1976-2 Manifold Elbow. For PCM exhaust applications, see the PCM Exhaust Elbow.
Related Exhaust System Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.